Zyxel 48-Port Gigabit Ethernet Smart Managed Switch with 4 Gigabit Combo Ports and 2 SFP Ports [GS1920-48] Smart managed switch with essential L2 features GbE RJ-45, GbE combo (RJ-45/SFP) and fixed GbE SFP connectivity Supports ZON Utility, ZON inter-device features and iStacking facilitates easy network initialization and management Reliable network availability with Loop Guard, IPSG, and CPU protection Smart managed switch with essential L2 features 44x Gbe RJ-45, 4x Gbe combo (RJ-45/SFP) (50 Ports Total) Reliable network availability with Loop Guard, IPSG, and CPU protection Intrusion lock, RADIUS, static MAC forwarding and 802.1X authentication-enhance network security Future-proofed with IPv6 support